If you simply choose not to tell it, then yes you need to confess the sin of receiving unworthily.
But I think you need to trust the priest you are confessing to. It sounds like he feels you are confessing the same thing over and over, just adding details.
If you say, forgive me father I have sinned, I committed adultery.
Or
you say forgive me father I have sinned, I was very attracted to my neighbor. I sinned in my thoughts. I tried to fight it, but one night I got drunk. We were just sitting there talking and he was so kind to me about my problems…In the end I slept with him.
Both are confessing the same sin. One just adds details. My old priest always taught young children to keep it simple. God know the details. A person can be seriously contrite and show serious contrition without getting into the gory details.
A priest may ask for details, be prepared to give them.
As I said, it sounds as if your priest feels you are confessing the same sin over and over with added details, not a new sin that needs to be forgiven.
Only you can know. But if in doubt, go and talk to your confessor. Ask him if he thought you were just giving extra details to the same sin or confessing new sins. This will help guide you in future confessions. God does not wish you to walk around with doubt, confession is a gift for us to be able to walk in confidence and hopeful joy. You will feel better to get this all settled from your confessor.
God Bless,
Maria